A person who loves a worldly person always doubts, and is in constant dilemma wondering, "The one whom I love, does he love me or not? And if he does, how much does he love me?" We always get caught up in thoughts like this. This is because, in this world, no one shows real sentiments. Some pretend to show more love by writing many letters, while others hide and don't express at all. Also, we always try to show that we love the other person more than he loves us. But, all the while, internally we want the other to love us more than we love him. That is why the one who loves the world is mostly tense, and wonders whether or not the other person loves him.
In the spiritual realm, there are no such worries. If you would like to determine how much your ishta deva (the chosen form of God you worship) and your Guru loves you, just measure your love. He loves you as much as you love Him. If you love Him less, then He also loves you little. If you love Him more, then He will also love you to the same extent.